19-1474; Rev 0; 4/99
3.3V-Pow e re d, ±15kV ESD-Prote c te d, 12Mbps a nd
Sle w -Ra te -Lim ite d True RS -485/RS -422 Tra ns c e ive rs
5680/MAX3491E
Ge n e ra l De s c rip t io n
Fe a t u re s
Devices in the MAX3483E family (MAX3483E/MAX3485E/
MAX3486E/MAX3488E/MAX3490E/MAX3491E) a re
±15kV ESD-protected, +3.3V, low-power transceivers for
RS-485 and RS-422 communications. Each device con-
tains one driver and one receiver. The MAX3483E and
MAX3488E feature slew-rate-limited drivers that minimize
EMI and reduce reflections caused by improperly termi-
nated cables, allowing error-free data transmission at
data rates up to 250kbps. The partially slew-rate-limited
MAX3486E transmits up to 2.5Mbps. The MAX3485E,
MAX3490E, and MAX3491E transmit at up to 12Mbps.
♦ ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
♦ Operate from a Single +3.3V Supply—
No Charge Pump Required
♦ Interoperable with +5V Logic
♦ Guaranteed 12Mbps Data Rate
(MAX3485E/MAX3490E/MAX3491E)
All devices feature enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-
Ga p Dis c ha rg e , ± 8kV us ing IEC 1000-4-2 Conta c t
Discharge, and ±15kV using the Human Body Model.
♦ Slew-Rate Limited for Errorless Data Transmission
(MAX3483E/MAX3488E)
♦ 2nA Low-Current Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
Drivers are short-circuit current limited and are protect-
ed against excessive power dissipation by thermal
shutdown circuitry that places the driver outputs into a
high-impedance state. The receiver input has a fail-safe
fe a ture tha t g ua ra nte e s a log ic -hig h outp ut if b oth
inputs are open circuit.
♦ -7V to +12V Common-Mode Input Voltage Range
♦ Full-Duplex and Half-Duplex Versions Available
♦ Industry-Standard 75176 Pinout
(MAX3483E/MAX3485E/MAX3486E)
♦ Current-Limiting and Thermal Shutdown for
The MAX3488E, MAX3490E, and MAX3491E feature
full-d up le x c ommunic a tion, while the MAX3483E,
MAX3485E, a nd MAX3486E a re d e s ig ne d for ha lf-
duplex communication.
Driver Overload Protection
Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
MAX3483ECSA
MAX3483ECPA
MAX3483EESA
MAX3483EEPA
MAX3485ECSA
MAX3485ECPA
MAX3485EESA
MAX3485EEPA
Ap p lic a t io n s
Telecommunications
8 Plastic DIP
8 SO
Industrial-Control Local Area Networks
Transceivers for EMI-Sensitive Applications
Integrated Services Digital Networks
Packet Switching
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
Ordering Information continued at end of data sheet.
S e le c t o r Gu id e
GUARANTEED SUPPLY
DRIVER/ SHUTDOWN
RECEIVER CURRENT
±15kV
ESD
PROTECTION
PART
NUMBER
HALF/FULL SLEW-RATE
PIN
COUNT
DATA RATE
(Mbps)
VOLTAGE
(V)
DUPLEX
LIMITED
ENABLE
(nA)
MAX3483E
MAX3485E
MAX3486E
MAX3488E
MAX3490E
MAX3491E
0.25
12
Half
Half
Half
Full
Full
Full
Yes
No
Yes
Yes
Yes
No
2
2
Yes
Yes
Yes
Yes
Yes
Yes
8
8
2.5
0.25
12
Yes
Yes
No
2
8
3.0 to 3.6
—
—
2
8
No
8
12
No
Yes
14
________________________________________________________________ Maxim Integrated Products
1
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